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present experiments present experiments this is not straightforward, indeed uncertainties on theoretical evaluations of span one order of magnitude at least claimed evidence only by a part of the collaboration started in 2003 G(Q,Z) |M nucl | 2 G(Q,Z) |M nucl | 2 1 m = m = |M nucl | 2 m a comparison between the different experiments requires to extract from the lower limit for an upper limit for m * using nuclear calculations of Staudt et al. Europhys. Lett 13 (1990) 31